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NASA Images
by NASA/Solar & Heliospheric Observatory
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The most distinctive feature on the Sun this past week has been a medium-sized coronal hole seen as the dark area in the lower right quadrant in this image from the STEREO (Ahead) spacecraft (May 25, 2007). When combined with an image taken by the Behind spacecraft, the image becomes 3D. Coronal holes appear darker in ultraviolet images, in this instance, in a spectral line of eleven-times ionized iron, formed at temperatures of about 1.5 million K. Since coronal holes are 'open' magnetically,...
Topics: What -- Sun, What -- STEREO, What -- Earth, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/01jun2007/
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by NASA/Solar & Heliospheric Observatory
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Sunspots last anywhere from days to months. And the Sun rotates about once every 27-30 days, depending on which latitude one is tracking. Well, over the past 18 days or so, (January 13 - 31, 2006) SOHO observed a good-sized active region (which would be seen as a sunspot group in "normal" white light observing) disappear around the right side of the Sun and be carried around by rotation to re-appear about 13 days later on the left side. As seen in extreme ultraviolet wavelength of...
Topics: What -- Sun, What -- SOHO, What -- Earth
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/02feb2007/
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by NASA/Solar & Heliospheric Observatory
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This week SOHO observed sunspot 944 coming around the Sun's eastern limb--for the fifth time! Usually sunspots form and dissolve in a matter of days or weeks, but this spot has real longevity-it has survived for an unusually long five solar rotations. Here we put side-by-side images at almost exactly three of the five rotations. The Sun rotates about once every 27 days. A sunspot receives a new number each time it reappears, so three months ago this was called Sunspot 930 when it blasted out a...
Topics: What -- SOHO, What -- Sun
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/02mar2007/
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by NASA/Solar & Heliospheric Observatory
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This week SOHO offers a comparison of solar observations from the same instrument a solar cycle: two EIT 304 Angstrom images (in extreme ultraviolet light) across exactly eleven years. This is about the average length of a solar cycle. The left-hand image is an early EIT image from SOHO, taken October 1996 when the Sun was near its minimum level of activity. It is quite similar in the general level of solar activity observed (usually seen as whiter areas in these kinds of images) to the...
Topics: What -- SOHO, What -- Sun, What -- Polar
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/02nov2007/
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by NASA/Solar & Heliospheric Observatory
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Here is one way to demonstrate concretely that STEREO is watching the Sun seven days a week, 24 hours a day. We have put together an entire week's (April 22- 28, 2007) worth of frames into a movie of the Sun in extreme ultraviolet light (304 Angstroms). The frames do not show off any major solar events. The devil, as they say, is in the details and what lovely details are revealed. The Sun's edge can be seen busily erupting with little spicules (vertical spikes), sliding plasma, small...
Topics: What -- STEREO, What -- Sun, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/04may2007/
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by NASA/Solar & Heliospheric Observatory
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Just as 2006 was about to end, the Sun decided to blast out two more CMEs, perhaps as a symbol of New Year's revelry. At any rate, in the span of 24 hours (Dec. 30-31, 2006), two separate CMEs blew out to the right of the Sun at close to identical locations. The first event was a good-sized solar storm with a classical, expanding bulbous shape. The second, smaller event was more linear and directional as it left the Sun. Incidentally, Mercury can once again (remember its transit in November?)...
Topics: What -- Sun, What -- Mercury, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/05jan2007/
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by NASA/Solar & Heliospheric Observatory
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Using STEREO (Ahead) spacecraft's highest resolution frames (2048àö__2048 pixels per frame), we can zoom in a lot on areas of interest and still maintain good visual acuity. Over 34 hours (June 29-30, 2007), we zoom in on a pair of active regions and observe numerous instances of flaring activity, especially from the lead one of the two. These were low intensity flares. With frames taken every 10 minutes (and paced here at six frames a second), the motion is not jumpy or freeze-framed. It...
Topics: What -- STEREO, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/05jul2007/
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by NASA/Solar & Heliospheric Observatory
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Many people ask if we are at solar minimum yet and how do we know when we are. Solar minimum is the period when the Sun has reached its lowest point of solar activity in its 11-year cycle. One way to see if we are there yet is to observe the solar corona, easily seen in SOHO's C2 coronograph images. The structure we see in the coronagraph images is a marker for the global magnetic field extending into the corona and heliosphere. When the Sun is at its minimum and the corona is...
Topics: What -- Sun, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/05oct2007/
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by NASA/Solar & Heliospheric Observatory
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We last saw Comet Machholz as a bright comet streaking past the Sun on Jan. 8, 2002 (see Hotshot from 2002 [ http://soho.nascom.nasa.gov/hotshots/2002_01_08/ ]). Well, guess what! It's back! After over five years of swinging through its elliptical orbit out in space, the same comet has returned. Though not as bright as it appeared last time around, it is hard to miss as it rises from the lower left in our LASCO C3 coronagraph's field of view. Note that the comet's tail always angles away from...
Topics: What -- Sun, What -- COMETS, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/06apr2007/
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Over a five-day stretch (Nov. 30 - Dec. 4, 2007) SOHO observed two remarkably similar coronal mass ejections (CMEs). The first one blew out to the right from the Sun as a familiar arch- shaped, bulbous CME. Just four days later another, slightly larger, CME headed out to the right in just about the same direction and similarly shaped. With the Sun being near its minimum period of activity, it was a little surprising to see two CMEs in this short a span of time. With the brilliant Sun blocked...
Topics: What -- SOHO, What -- Sun
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/07dec2007/
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by NASA/Solar & Heliospheric Observatory
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When the Sun is in its quiet period as it is now, it often presents some very distinctive coronal structures that can be observed with SOHO's coronagraphs. In this still and video clip (September 2-5, 2007) one can see several, well-defined, lighter lines extending out into space. These are shaped by relatively long-lived magnetic features near the Sun's surface that extend out into space. Most solar scientists would call these "streamers." In the video clip you can watch as the...
Topics: What -- Sun, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/07sep2007/
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by NASA/Solar & Heliospheric Observatory
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Once again we get to observe solar plasma sliding and zipping along above the edge of the Sun (May 30-31, 2007). With STEREO we are receiving an image every few minutes from each instrument, giving us detailed close-up views of smooth motion. The focal point of this activity was an active region rotating into view when we zoomed in on its action for about 2 days. An active region, an area of intense magnetic forces, is driving a lot of the activity we see. The plasma is being controlled by...
Topics: What -- Sun, What -- STEREO, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/08jun2007/
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by NASA/Solar & Heliospheric Observatory
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A close up view of the top of the Sun as seen in profile shows thousands of little spurts, like small blow torches, shooting out all over the Sun. The movie shows just an average day's worth of this kind of activity as seen from the STEREO spacecraft (Ahead) in extreme ultraviolet light (August 3, 2007). These spurts are called spicules. With STEREO's 2048àö__2048 image resolution and an image every 10 minutes, we can zoom in on features like this with no distortion. Spicules are plasma jets...
Topics: What -- Sun, What -- STEREO, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/09aug2007/
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On 2007 February 8, the SOHO Extreme ultraviolet Imaging Telescope (EIT) became the first spaceborne solar imager to observe a complete solar cycle. EIT has now been observing for the mean length of a solar cycle, 11.1 years, since its first image was obtained on 1996 January 2. SOHO is the first solar observatory in space to observe a complete solar cycle. It has the unique opportunity of offering a retrospective reaching back over an entire solar cycle. So we can select and compare images and...
Topics: What -- SOHO, What -- Extreme Ultraviolet Imaging Telescope, What -- Imager, What -- Opportunity,...
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/09feb2007/
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by NASA/Solar & Heliospheric Observatory
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An interesting coronal mass ejection (CME) blasted into space on March 5, 2007 as observed by the LASCO C2 instrument. The CME was not particularly large, but its core held its central shape together like a static object. As the bulbous front end of the CME emerged from behind the occulting disk, it carved out a dark area, which we usually see as a brighter edge. Then as the darker mass moved away from the Sun, the second half of the teardrop-shaped cloud appeared as whiter, suggesting a...
Topic: What -- SOHO
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/09mar2007/
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The STEREO (behind) spacecraft observed this small prominence rising up from the Sun's surface, twisting around, and subsiding over about a 36-hour period (Oct. 31- Nov. 1, 2007). The charged particles that make up the prominence are responding to powerful magnetic forces that compel the prominence to bend to the arcing field lines. But the forces are not constant: they are often in flux. We see this when the direction of the particles changes near the end of the clip. The material seen at this...
Topics: What -- STEREO, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/09nov2007/
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On May 9, 2007 two smaller coronal mass ejections (CMEs)burst out from the Sun. The first one headed to the left; the second, to the right, suggesting that they perhaps did not share the same source. Since CMEs of any visible size have been fairly rare over the past several months, the fact that we see two in one day is noteworthy. These were observed with our LASCO C2 coronagraph, one of two coronagraphs on SOHO. These are our best tools for observing solar storms in the corona. We continue to...
Topics: What -- Sun, What -- SOHO, What -- Earth
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/11may2007/
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by NASA/Solar & Heliospheric Observatory
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The very bright object in the upper left edge of our LASCO coronagraph image is comet C/2006 P1 (Comet McNaught). It was discovered on August 7th, 2006 by the hugely successful comet discoverer Rob McNaught. Then the comet was a very faint object, but it brightened considerably as it approached the Sun - to within just 0.17 astronomical units (the average distance between the Earth and Sun is about 150 million kilometers). As seen here (January 12, 2007) it is probably at its brightest because...
Topics: What -- Sun, What -- Earth, What -- SOHO, What -- COMETS, What -- Imager, What -- Mercury, Where --...
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/12jan2007/
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Over a four-day period (July 7-11, 2007) of watching the Sun's atmosphere with SOHO's C2 coronagraph, we observed a sputtering outflow of particles from an active region. Although none of the distinct outbursts were particulary strong, at least six to eight clouds of particles were thrust into space. The rest of the time was generally marked by recurrent flows or a streaming of charged particles. That active region has since lost much of its energy and is much quieter than it was. The white...
Topic: What -- SOHO
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/12jul2007/
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For the first time we are featuring an observation from one of the STEREO coronagraphs. This COR2 still and video clip (from the Ahead spacecraft) show a modest coronal mass ejection blasting into space over a two-day period (October 4-5, 2007). What is different about these images compared to those of SOHO's coronagraphs? STEREO's COR2 coronagraphs provide images with twice the resolution of SOHO's at about the same frame rate so that finer details are more easily seen. And with one on each of...
Topics: What -- STEREO A, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/12oct2007/
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For the ninth day in a row (as of April 12, 2007), the Sun has appeared spotless. No sunspots, Zip. We really are in the midst of solar minimum when the Sun's activity level in its 11 year cycle is at its lowest. Dr. Tony Phillips (of spaceweather.com [ http://spaceweather.com/ ]) recalled that during the last solar minimum in 1996 the Sun was spotless for 37 days! So at this point we are still far from those tedious doldrums. Sunspot watchers are getting antsy, but what are you going to do?...
Topics: What -- Sun, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/13apr2007/
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One of the STEREO spacecraft (Ahead) caught an enourmous wave as it rippled across the most of the Sun (Dec. 7, 2007). While the visual effect is subtle when observed in at extreme UV wavelengths, (especially in any still image) there is nothing subtle about the roughly 500,000 miles it traverses at a speed of 500-1500 km/s in a just few hours or the amount of energy it carries. This event was likely triggered by a small flare and CME from Active Region 977. Scientists believe this is the most...
Topics: What -- STEREO, What -- Sun, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/14dec2007/
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Over a period of four days (July 27 - 31, 2007) two active regions can be seen by SOHO communicating with each other magnetically. While the areas remained fairly stable, in that they did not generate any solar storms, the magnetic field lines of connection between them shift and sway most of the time. Like two magnets that sit near each other, the magnetic fields of the active regions share a dynamic interplay that is fun to watch. While we cannot actually see magnetic field lines, we can see...
Topics: What -- SOHO, What -- Sun
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/15aug2007/
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SOHO had a ring-side seat to watch as a sun-grazing comet swept by the Sun on June 8, 2007. With its tail stretching far out behind it, it was one of the brightest sun-grazers that we have seen. This one belongs to the Kreutz family of comets, thought to belong to a much larger comet that broke up some 2,000 years ago These groups are the result of a much larger comet that broke up some 2,000 years ago during its perihelion (closest approach to the Sun) passage. By Kreutz standards, this one is...
Topics: What -- SOHO, What -- Sun, What -- COMETS
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/15jun2007/
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For the past few days, the Earth has been passing through a stream of solar wind that is flowing out of this coronal hole (seen here on March 12-14, 2007). Coronal holes appear as dark area of the corona when viewed in ultraviolet light (here) and in X-rays. Since coronal holes are 'open' magnetically, strong solar wind gusts can escape from them and carry solar particles out to our magnetosphere and beyond. Solar wind streams take several days to travel from the Sun to Earth, and the coronal...
Topics: What -- Earth, What -- Sun, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/16mar2007/
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A well-positioned and substantial coronal hole can be seen (right of center) in this (November14, 2007) image by SOHO. Coronal holes appear as the dark areas when viewed in this wavelength (284 Angstrom) of extreme ultraviolet light and others as well. It has been rotating around towards the center of the Sun over the past week or so. Since coronal holes are 'open' magnetically, strong solar wind gusts can escape from them and carry solar particles out to our magnetosphere and beyond. Solar...
Topics: What -- SOHO, What -- Sun, What -- Earth
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/16nov2007/
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Active regions and magnetic loops as recorded by EIT in the Fe IX/X 171Ôø_ line. The temperature of this material is about 1 million K in the lower corona.
Topic: What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/images/171loops.html
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This is one of the clearest and most engaging clips of solar plasma shimmying and arcing above the edge of the Sun that we have ever been able to view (May 9-10, 2007). With STEREO's high frame rate (an image every few minutes) and high resolution, we can zoom in on areas of interest yet maintain image clarity. This large sunspot was just rotating to the edge of the Sun when we zoomed in on its action for about 18 hours. The active region, a hot bed of intense magnetic forces, is the source of...
Topics: What -- Sun, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/18may2007/
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The Earth passed through a stream of solar wind that flowed out of this expansive coronal hole (seen in lower central area of the Sun in still on January 14, 2006). Coronal holes appear as a dark area of the Sun when viewed in ultraviolet light (as it is here) and in X-rays. Since coronal holes are 'open' magnetically, strong solar wind gusts can escape from them and carry solar particles out to our magnetosphere and beyond. Solar wind streams take several days to travel from the Sun to Earth,...
Topics: What -- Earth, What -- Sun, What -- SOHO, Where -- Wisconsin
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/19jan2007/
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CME blast seen by LASCO C2 -- An image sequence over 90 minutes of a large coronal mass ejection 10 April 2001 associated with an X2.3 flare. A CME blasts a billion tons ofparticles traveling millions of kilometers an hour into space. This CMEimpacted Earth about 36 hours later and caused a severe geomagnetic storm.
Topics: What -- Earth, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/images/200104100530c2ser.html
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Joseph B. Gurman Normal Joseph B. Gurman 1 0 2002-02-27T15:45:00Z 2002-02-27T15:45:00Z 1 54 313 NASA GSGC 2 1 384 9.2511 800x600 150 0 0 Large magnetic loop as recorded by EIT in the Fe IX/X 171Å line. The temperature of this material is about 1 million K in the lower corona. The large loop on the right arches over an active region. The extreme ultraviolet image enables us to see tight, loop-like magnetic fields that extend above the Sun's surface around which charged particles are spinning...
Topic: What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/images/20020227eit171looprt.html
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This is a classic image of a "halo event," so called because the circular area of the edges of the blast seems to form a kind o Joseph B. Gurman Normal Joseph B. Gurman 2 2003-03-04T15:22:00Z 2003-03-04T15:22:00Z 1 NASA GSGC 1 1 9.2511 800x600 0 0 This is a classic image of a "halo event," so called because the circular area of the edges of the blast seems to form a kind of halo around the Sun. In the image taken by LASCO C2 on 16 July 2002, one can observe particles...
Topics: What -- Sun, What -- Earth, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/images/20020716c2halo.html
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Joseph B. Gurman Normal Joseph B. Gurman 2 2003-03-04T14:52:00Z 2003-03-04T14:52:00Z 1 NASA GSGC 1 1 9.2511 800x600 0 0 This LASCO C2 image shows a very large coronal mass ejection(CME) blasting off into space on 2 December 2002. It presents the classic shape of a CME: a large bulbous front with a second,more compact, inner core of hot plasma. This material erupts away from the Sun at speeds of one to two millionsmiles (or km) per hour.
Topics: What -- Sun, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/images/20021202c2cme.html
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CME blast -- A large coronal mass ejection ejects a cloud of particles into space on 2 December 2003. In this composite an EIT 304 image of the sun from about the same time has been appropriately scaled and superimposed on a LASCO C2 image where a red occulting disk can be seen extending around the Sun. This LASCO coronagraph instrument allows details in the corona to be observed.
Topics: What -- Sun, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/images/20031202c2eit304.html
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SOHO has observed (Dec. 13, 2007) what may be the first indication of a "reversed" magnetic polarity region when compared to the current solar cycle, something scientists consider to be a crucial indicator that the new sunspot cycle is about upon us. This so-called plage region did not have a strong enough magnetic field to form a sunspot, but scientists believe that it may nevertheless stand as an icon that the old cycle is ending and a new one, Cycle 24, is about to begin. Sunspots...
Topics: What -- SOHO, What -- Sun
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/21dec2007/
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Just like its "cousin" nine days ago, yet another small comet appeared in the lower left area of the field of view of SOHO's C3 coronagraph instrument (February 14-15, 2007 and streaked right towards the Sun. This "sungrazer" comet followed almost exactly the same trajectory as the comet observed on Feb. 6. They both most likely belonged to the Kreutz comet group. Kreutz comets are a family of comets that we often spot passing near the Sun. The members of the Kreutz group...
Topics: What -- Sun, What -- COMETS, What -- SOHO, Where -- China
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/21feb2007/
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STEREO captured three differently shaped CMEs (coronal mass ejections) blasting out from the Sun over a three-day span (November 14-17, 2007). The COR2 (ahead) coronagraph, taking an image very 20 minutes, lets us generate a smooth motion movie of these events. The first CME billowed out as a doughnut-shaped CME to the lower right. The second one, late on Nov. 15, was a much more diffuse, "halo" CME that seemed to create a faint halo around the Sun as it expanded in all directions. In...
Topics: What -- STEREO, What -- Sun, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/21nov2007/
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SOHO observed (September 19, 2007) a wide coronal hole that appeared as the large dark area when viewed in this wavelength (284 Angstrom) of extreme ultraviolet light (here) and in X-rays. It has been rotating around towards the center of the Sun over the past week or so. Since coronal holes are 'open' magnetically, strong solar wind gusts can escape from them and carry solar particles out to our magnetosphere and beyond. Solar wind streams take several days to travel from the Sun to Earth, and...
Topics: What -- SOHO, What -- Sun, What -- Earth
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/21sep2007/
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This week STEREO observed a nice gathering of solar prominences in profile as they twisted, stretched and floated just above the solar surface. Over about two and a half days (August 16-18, 2007), the prominences were seen in extreme ultraviolet light by the Ahead spacecraft. Prominences are clouds of cooler gases controlled by powerful magnetic forces that extend above the Sun's surface. The careful observer can sometimes see the gases arcing out from one point and sliding above the surface to...
Topics: What -- STEREO, What -- Sun, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/22aug2007/
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*Captions:* * Blue (171 Angstroms) full disk image: The Sun's million degree atmosphere taken on Dec. 4 by STEREO's SECCHI/EUVI telescope. The close-up of the active region is cropped from the full disk image. * Blue (171 Angstroms): The Sun's million degree atmosphere taken on Dec. 4 by STEREO's SECCHI/EUVI telescope. Close-up of the active region cropped from the full disk image. * Orange (304 Angstroms) full disk: The orange image shows portions of the sun's atmosphere at 60,000 to 80,000 C...
Topics: What -- Sun, What -- STEREO, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/22dec2006/
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The main noteworthy feature on the Sun this past week is the one, dark, coronal hole that we watched as it rotated to the Sun's center over three days (June 17-19, 2007). Anyone who inspects the movie carefully will note that there were no looping arcs, no flares or solar storms, no filaments, and no bright active regions. Yes, the Sun remained largely featureless except for the coronal hole, and even that hole is not particularly large as these things go. We should note too that the north and...
Topics: What -- Sun, What -- Polar, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/22jun2007/
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Grab your 3D glasses (if you have any around) and get ready for something never seen before by anyone. We proudly present to you the first ever actual 3D stills and movies of the Sun from the twin STEREO spacecraft. These images were just released on April 23, 2007. And even if you can't see them in 3D, you can still enjoy the unsurpassed levels of detail in these 2D, full disk solar images with twice the resolution of SOHO. The still image taken on March 24, 2007 shows a coronal hole (darker...
Topics: What -- Sun, What -- STEREO, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/23apr2007/
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Foreshadowing is a literary device to hint at what is coming later in a story. We are going to engage in a little foreshadowing with the Sun. As of the beginning of March 19, 2007, there were no sunspots on the Sun and no indication of when any activity would be observable. And even on March 20, no sunspots could be observed in the ultraviolet wavelengths of light or even filtered white light. But like storm clouds on a horizon, disturbances above an active region had already begun to come into...
Topics: What -- Sun, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/23mar2007/
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A bright and expansive coronal mass ejection (CME) unfurled itself over about an eight-hour period (January 24, 2006) this week. As seen in SOHO's LASCO C2 coronagraph, the bright front emerged in the shape of an arc from behind the occulting disk but soon expanded into a ragged, bulbous shape with lots of structural lines inside it. (The Sun is represented by the white circle in the center of the red occulting disk.) The source of this CME was apparently an active region just beginning to...
Topics: What -- Sun, What -- Earth, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/26jan2007/
NASA Images
by NASA/Solar & Heliospheric Observatory
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While it may look otherworldly, this is still just the Sun and its environs as seen from SOHO (July 24, 2007). By combining these three views onto one image we can try to suggest SOHO's expansive capacity to see the Sun itself and activity in its corona (the area around it) at virtually the same time. This composite image blends the Sun itself in extreme UV light (from EIT at 304 Angstroms) with the smaller expanse around it as seen from the LASCO C2 coronagraph), and the much larger view (from...
Topics: What -- Sun, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/26jul2007/
NASA Images
by NASA/Solar & Heliospheric Observatory
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Is this a true 3D Sun? Actually, no. This is what we might call a "manufactured" 3D Sun. It was produced by combining two SOHO images from its EIT 195 instrument that were taken 10.5 hours apart on October 23, 2007. Because the Sun rotates once every 27 days or so (about 13 degrees per day then), by using two images almost half day apart, we are achieving about 6 degrees of changed perspective. That is enough to produce a kind of 3D effect - but, of course, the Sun has changed some in...
Topics: What -- Sun, What -- SOHO, What -- STEREO, What -- Earth
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/26oct2007/
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After waiting for around three weeks, the Sun has finally gotten over its doldrums and produced a fairly sizeable active region (AR953). That is probably the longest stretch of time without an active region (or sunspot) since the last solar minimum about 11 years ago. We decided to show you the quiet rotation of the Sun in extreme ultraviolet light from April 8 - April 27, 2007. The active region appears as the much brighter area that rotates into view around April 25th. There even seems to be...
Topics: What -- Sun, What -- Polar, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/27apr2007/
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One of the STEREO spacecraft (Behind) observed an elongated loop that emerges and then disperses over a two-day period (September 22-23, 2007). This immense structure is generated by magnetic forces rooted inside the Sun. Observed in the 304 Angstrom wavelength of extreme ultraviolet light, it rises up, takes shape, hovers, then gradually and gracefully breaks away from the magnetic forces that held it in place. Its complex twisting and writhing show the complexities of the Sun's magnetic field...
Topics: What -- STEREO, What -- Sun, What -- Earth, What -- Moon, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/28sep2007/
NASA Images
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SOHO is keeping a close eye on a good-sized active region that is rotating into view. The video clip covers 36 hours (June 27-28, 2007) as the bright glow and arcs above the solar surface appear before we can actually see a sunspot on the surface of the Sun. The images were taken in extreme ultraviolet light at the 195 Angstrom wavelength. There have not been very many sunspots over the past year or so, so this one is generating some interest among solar observers. The sunspot that preceded it...
Topics: What -- SOHO, What -- Sun
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/29jun2007/
NASA Images
by NASA/Solar & Heliospheric Observatory
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Series of LASCO C3 images showing two comets approaching the Sun. The time period covers about 4 hours. They do not reappear on the other side.
Topics: What -- COMETS, What -- Sun, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/images/2comets.html
NASA Images
by NASA/Solar & Heliospheric Observatory
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Two "Sungrazing" comets are seen heading in tandem towards the Sun?s corona. They do not reappear on the other side. The comets follow similar but not identical orbits and enter the tenuous outer atmosphere of the Sun. Shortly after the comets disappeared behind the occulting disks of the coronagraph, a bright helical-shape prominence erupts from the Sun as part of a CME. The planet Mars can be seen in the upper right corner while the bright star Aldebaran can be seen in the lower...
Topics: What -- COMETS, What -- Sun, What -- Mars, What -- ALDEBARAN, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/images/2cometsstill.html
NASA Images
by NASA/Solar & Heliospheric Observatory
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Arching prominence - This bulbous solar prominence was taken 11 April 2003 by the EIT 304 instrument. This one extends over 30 times the size of earth out from the Sun. Prominences, which consist of cooler plasma, are suspended above the Sun by magnetic forces and can last from hours to weeks.
Topics: What -- Earth, What -- Sun, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/images/304arch.html
NASA Images
by NASA/Solar & Heliospheric Observatory
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A comparison of three images over four years apart illustrates how the level of solar activity has risen from near minimum to near maximum in the Sun's 11-years solar cycle. These images are captured using He II 304 ? emissions showing the solar corona at a temperature of about 60,000 degrees K. Many more sunspots, solar flares, and coronal mass ejections occur during the solar maximum. The increase in activity can be seen in the number of white areas, i.e., indicators of strong magnetic...
Topic: What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/images/304time.html
NASA Images
by NASA/Solar & Heliospheric Observatory
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Solar study spacecraft from a number of missions observe the Sun in various wavelengths of light every day. This representative collage, made from images taken on November 25, 2007, suggests some (but not all) of the various missions and wavelengths that are captured and made available on the web daily. By observing in different wavelengths of light the instruments show different features of the Sun at different temperatures and elevations above the surface. And when you consider the two STEREO...
Topics: What -- Sun, What -- STEREO, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/30nov2007/
NASA Images
by NASA/Solar & Heliospheric Observatory
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A close-up of an active region of the Sun from STEREO's Ahead spacecraft in extreme ultraviolet revealed an interesting, yet subtle, phenomenon. Besides a pair of small eruptions over this 40-hour period (Aug. 23-24, 2007), one small point was the source of a steady outpouring of material in all directions around it during the whole time, almost like a sparkler. It may not be an actual outflow into the solar wind - these are likely just the footprints of longer loops that continue upwards at...
Topics: What -- Sun, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/pickoftheweek/old/31aug2007/
NASA Images
by NASA/Solar & Heliospheric Observatory
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SOHO on the Atlas II-AS (AC-121), Cape Canaveral Air Station, 2 December 1995. SOHO was launched on 2 December 1995, 03:08 EST (08:08 UT).
Topics: What -- SOHO, What -- Atlas
Source: http://sohowww.nascom.nasa.gov/gallery/Spacecraft/95PC-1746.html
NASA Images
by NASA/Solar & Heliospheric Observatory
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SOHO on the Atlas II-AS (AC-121), Cape Canaveral Air Station, 2 December 1995. SOHO was launched on 2 December 1995, 03:08 EST (08:08 UT).
Topics: What -- SOHO, What -- Atlas
Source: http://sohowww.nascom.nasa.gov/gallery/Spacecraft/95PC-1747.html
NASA Images
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SOHO on the Atlas II-AS (AC-121), Cape Canaveral Air Station, 2 December 1995. SOHO was launched on 2 December 1995, 03:08 EST (08:08 UT).
Topics: What -- SOHO, What -- Atlas
Source: http://sohowww.nascom.nasa.gov/gallery/Spacecraft/95PC-1748.html
NASA Images
by NASA/Solar & Heliospheric Observatory
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A composite of three images of a large CME. The images are from EIT (the blue Sun in the center) and the LASCO C2/C3 instruments.
Topics: What -- Sun, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/images/agueit.html
NASA Images
by NASA/Solar & Heliospheric Observatory
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Huge sunspot group -- Active region 9393 as seen by MDI hosted the largest sunspot group observed so far during the current sol Joseph B. Gurman Normal Joseph B. Gurman 1 0 2001-04-11T18:27:00Z 2001-04-11T18:27:00Z 1 NASA GSGC 1 1 9.2511 800x600 0 0 Huge sunspot group -- Active region 9393 as seen by MDI hosted the largest sunspot group observed so far during the current solar cycle. On 30 March 2001, the sunspot area within the group spanned an area more than 13 times the entire surface of the...
Topic: What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/images/bigspotfd.html
NASA Images
by NASA/Solar & Heliospheric Observatory
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An image sequence over less than two hours of a coronal mass ejection 7 April 1997 taken by LASCO C2. In this sequence a CME blasts into space a billion tons of particles travelling millions of miles an hour.
Topic: What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/images/c24panelApr97.html
NASA Images
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A coronal mass ejection (CME)on August 16, 2001, is captured by the LASCO C2 instrument as it first erupts (left). Just over an hour later in a wider view from LASCO C3 the CME is also accompanied by fast, high energy protons that have struck the SOHO spacecraft's detectors. This larger view encompasses 30 times the radius of the Sun.
Topics: What -- SOHO, What -- Sun
Source: http://sohowww.nascom.nasa.gov/gallery/images/c2c3.html
NASA Images
by NASA/Solar & Heliospheric Observatory
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LASCO C2/C3 composite image series showing a CME cloud emerging from the Sun and an ensuing proton blast that struck the SOHO instrument on 5 November 1998. Protons accelerated to 10% the speed of light arrived at SOHO in about an hour, causing numerous bright points and streaks in the last two images.
Topics: What -- Sun, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/images/c2c3protons.html
NASA Images
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Image of two coronal mass ejections 31 May 2001 taken by LASCO C2. Nearly simultaneously, two CMEs blast into opposite directions from the Sun, a fairly uncommon observation. CMEs eject a billion tons of particles traveling millions of miles an hour. The dark disk blocks the Sun so that the LASCO instrument can observe the structures of the corona in visible light.
Topics: What -- Sun, What -- Visible Light, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/images/c2dbl.html
NASA Images
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A LASCO C2 "running difference" image showing a "halo" CME blast beginning its journey towards Earth. With the LASCO C2 instrument providing a perspective of about six solar, the Sun is seen hurtling particles into space during a CME on 7 April 1997. The image compares one image to the preceding one and highlights the areas of change between the two. This gives a clearer representation of the dynamics of this "halo event," so called because the circular area of the...
Topics: What -- Earth, What -- Sun, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/images/c2dblast.html
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Blasting CME -- This LASCO C2 image, taken 8 January 2002, shows a widely spreading coronal mass ejection (CME) shooting billi Joseph B. Gurman Normal Joseph B. Gurman 2 2003-01-03T14:46:00Z 2003-01-03T14:46:00Z 1 NASA GSGC 1 1 9.2511 800x600 0 0 CME blast -- This dramatic coronal mass ejection was captured 7 August 2002 as it blasted billions of tons of particles millions of miles per hour out into space. The image was taken by the LASCO C2 instrument, which blocks out the Sun with an...
Topics: What -- Sun, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/images/c2eitcomp.html
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Double CME -- This LASCO C2 coronograph image from 8 November 2000 shows what appears to be two CMEs heading in symmetrically Double CME -- This LASCO C2 coronograph image from 8 November 2000 shows what appears to be two CMEs heading in symmetrically opposite directions from the Sun. An EIT 304Ôø_ image from the same day has been superimposed over the dark disk which blocks the Sun so that the LASCO instrument can observe the structures of the corona in visible light.
Topics: What -- Sun, What -- Visible Light, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/images/c2eitnov800.html
NASA Images
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LASCO C2 coronograph image in which a twisting, helical-shaped CME spins off from the Sun. This particular CME and erupting prominence is somewhat unusual in that the width of the blast is relatively narrow and the strands of plasma are twisting. The dark disk blocks the Sun so that the LASCO instrument can observe the structures of the corona in visible light. The white circle represents the size and position of the Sun.
Topics: What -- Sun, What -- Visible Light, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/images/c2helix.html
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CME observed by LASCO C2 --An image sequence over two hours of a large coronal mass ejection 20 March 2000 taken by the LASCO C2 instrument. In this sequence a CME blasts into space a billion tons of particles travelling millions of miles an hour. This CME was not headed towards Earth, though sometimes they are...
Topic: What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/images/c2panel00.html
NASA Images
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Active region loops observed on the West limb.
Topic: What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/SolarCorona/cds010.html
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CDS can produce images of the Sun at many wavelengths. In addition to hydrogen, the Sun's atmosphere contains atoms of common elements like helium, oxygen and magnesium. In the high temperature conditions of the Sun's atmosphere, these atoms emit light at different wavelengths depending on the temperature of the gas containing them. Therefore by tuning into different wavelngths we can make images of material which is at different temperatures. This capability is illustrated in the picture...
Topics: What -- Sun, What -- Earth, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/SolarCorona/cds015.html
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Before, during and after - a blinker event in O V (30,000 x 74,000 km). The three images are minutes apart in time.
Topic: What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/SolarCorona/cds016.html
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The left panel shows a monochromatic image of an eruption above the east limb observed in O V 629 ? on 19 May 1998. Line profiles in three spatial positions, A, B and C, have been marked and are displayed in the panel to the right. The area marked C represents the average disk profile with zero velocity. From the line shifts one can derive the line-of-sight velocity of the emitting plasma.
Topic: What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/SolarCorona/cds021.html
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Scientists with the instrument were surprised to discover that the Sun has tall gyrating storms far larger and faster than tornadoes on the Earth. So far they have detected a dozen such events. They occur most frequently near the north and south poles of the Sun and are almost as wide as the Earth. Steady wind speeds of 50,000 km/h and gusts ten times faster occur in the solar tornadoes.
Topics: What -- Sun, What -- Earth, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/SolarCorona/cds022.html
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The images were derived from full disk scans by CDS on 23 April 1998. As the temperature increases, the radiation comes from higher layers of the solar atmosphere, or corona, and is more strongly associated with solar activity. At the very highest temperatures, only the hot loops above active regions are visible. Scientists use images like these to probe the temperature structure of the solar atmosphere.
Topic: What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/SolarCorona/cds023.html
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The complex distribution and mixing of magnetic polarities (here displayed as yellow and blue) form a "magnetic carpet" over the entire Sun (upper right panel). The upper left panel shows the EUV emission taken simultaneously by CDS from plasma at the temperature of 250 000 K. The lower panel shows an overlay of the two images. Sequences of such images show that many of the transition region brightenings correspond to changes in the magnetic field.
Topics: What -- Sun, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/SolarCorona/cds024.html
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by NASA/Solar & Heliospheric Observatory
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Huge magnetic loops extending tens of thousands of km into space trapping hot gases inside them. We have seen such loop systems develop into extremely complex so-called 'active regions' where loops clash and twist like elastic bands before some kind of break down results in the ejection of clouds or streams of particles into space. The images show CDS' unique ability to map such regions. The coolest gases (20,000 degrees) are shown in the top left image, and the hottest (2 million degrees) in...
Topics: What -- Sun, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/SolarCorona/cds027.html
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Observing the Sun with a spectrometer like CDS one can derive the intensity and velocity distribution of the O V 629 ? line formed at approximately 230 000 K in AR8737. Pixels with Doppler shifts corresponding to a velocity greater than ?40 km/s is fully red/blue. Contours outline areas with velocities exceeding ?50 km/s. The velocities are calculated relative to the part of the solar disk (to the left) that is within the field of view.
Topics: What -- Sun, What -- Spectrometer, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/SolarCorona/cds028.html
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An eruption seen over the limb in the extreme-ultraviolet emission line of Oxygen V at 630 Angstroms. This CDS image shows material streaming back at high velocity onto the disk after the eruption. The left image shows intensity, while the middle and right show the Doppler velocity and width respectively. The blue color of the middle image represents material moving at greater than 200 kilometers per second toward the Sun. In the right image, the unresolved motions represented by the Doppler...
Topics: What -- Sun, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/SolarCorona/cds032.html
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Progress of a Coronal Mass Ejection (CME) observed over an eight hour period on 5-6 August 1999 by LASCO C3. The dark disk blocks the Sun so that the LASCO instrument can observe the structures of the corona in visible light. The white circle represents the size and position of the Sun.
Topics: What -- Sun, What -- Visible Light, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/images/cmeprogchart.html
NASA Images
by NASA/Solar & Heliospheric Observatory
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A bright and expansive coronal mass ejection (CME) unfurled itself on January 24, 2007. As seen in SOHO's LASCO C2 coronagraph, the bright front emerged in the shape of an arc from behind the occulting disk but soon expanded into a ragged, bulbous shape with lots of structural lines inside it. The source of this CME was an active region that had just began to rotate into view the next day. An EIT 304 Angstrom image of the Sun taken at nearly the same time was enlarged and superimposed on the...
Topics: What -- Sun, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/SolarCorona/combo001.html
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An extensive erupting prominence taken on 15 May, 2001 -- Prominences are huge clouds of relatively cool dense plasma suspended Joseph B. Gurman Normal Joseph B. Gurman 1 0 2001-06-13T15:55:00Z 2001-06-13T15:55:00Z 1 61 353 NASA GSGC 2 1 433 9.2511 800x600 0 0 An extensive erupting prominence taken on 15 May, 2001 -- Prominences are huge clouds of relatively cool dense plasma suspended in the Sun's hot, thin corona. At times, they can erupt, escaping the Sun's atmosphere. Emission in this...
Topic: What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/images/cropplume.html
NASA Images
by NASA/Solar & Heliospheric Observatory
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Solar rotation and polar flows of the Sun as deduced from measurements by MDI. The cutaway reveals rotation speed inside the Sun. The left side of the image represents the difference in rotation speed between various areas on the Sun. Red-yellow is faster than average and blue is slower than average. The light orange bands are zones that are moving slightly faster than their surroundings. The new SOHO observations indicate that these extend down approximately 20,000 km into the Sun. Sunspots,...
Topics: What -- Polar, What -- Sun, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/images/cutaway.html
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Cutaway - The three major zones of the Sun's internal structure are shown in this cutaway of an EIT 304 image. The core (temperature of 15 million degrees) is where the nuclear fusion occurs. In the large radiative zone the plasma and energy are gradually moved outwards from the core over a period of thousands of years. Finally, the hot plasma is cycled through a convection process (represented by the series of circles) in the convection zone up to the surface and out into space.
Topic: What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/images/cutaway00.html
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Twisting prominence. An EIT 304Å image of a large, twirling prominence taken on Jan. 18, 2000. Prominences are huge clouds of relatively cool dense plasma suspended in the Sun's hot, thin corona. At times, they can erupt, escaping the Sun's atmosphere.
Topic: What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/images/eit001.html
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An EIT 304Å image captures a pair of curving erupting prominences on 28 June 2000 -- Prominences are huge clouds of relatively cool dense plasma suspended in the Sun's hot, thin corona. At times, they can erupt, escaping the Sun's atmosphere. Emission in this spectral line shows the upper chromosphere at a temperature of about 60,000 degrees K. Every feature in the image traces magnetic field structure. The hottest areas appear almost white, while the darker red areas indicate cooler...
Topic: What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/images/eit002.html
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No Caption.
Topic: What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/images/eit003.html
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Joseph B. Gurman Normal Joseph B. Gurman 1 2001-02-05T16:41:00Z 2001-02-05T16:43:00Z 1 45 259 NASA GSGC 2 1 318 9.2511 800x600 0 0 One hour of a coronal mass ejection on Feb. 26-27, 2000 taken by EIT 195_Ö. A CME blasts into space a billion tons of particles travelling millions of miles an hour.¬¨Ä This particular¬¨Ä CME led to the "lightbulb- shaped" images seen by LASCO's C2 and C3 instruments on Feb. 27th and featured on our "Hot Shots" page.
Topic: What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/images/eit004.html
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EIT full sun images in Fe XII 195 A (left), Fe IX/X 171 A (middle), and the ratio of these two images (right). The latter one gives an indication of the temperature distribution in the Sun's corona with dark areas being cooler regions and bright areas being hotter. These images were recorded on 12 May 1996.
Topics: What -- Sun, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/SolarCorona/eit009.html
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Ratio of EIT full Sun images in Fe XII 195A to Fe IX/X 171A as recorded on 12 May 1996 between 06:53 and 06:59 UT. This line ratio gives an indication of the temperature distribution in the Sun's corona with dark areas being cooler regions and bright areas being hotter.
Topics: What -- Sun, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/SolarCorona/eit010.html
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SOURCES OF THE SOLAR WIND? --- "Plumes" of outward flowing, hot gas in the Sun's atmosphere may be one source of the solar "wind" of charged particles. These images, taken May 8, 1996, by the Extreme-ultraviolet Imaging Telescope (EIT) on board SOHO show ultraviolet images of polar plumes near the sout solar pole at about 1.5 million degrees Celsius in the Fe XII emission line at 195 A (top) and at somewhat cooler temperature at about 1 million degrees in the Fe IX/X...
Topics: What -- Extreme Ultraviolet Imaging Telescope, What -- SOHO, What -- Polar, What -- Opportunity
Source: http://sohowww.nascom.nasa.gov/gallery/SolarCorona/eit014.html
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SOURCES OF THE SOLAR WIND? --- "Plumes" of outward flowing, hot gas in the Sun's atmosphere may be one source of the solar "wind" of charged particles. These images, taken March 7, 1996, by the Solar and Heliospheric Observatory (SOHO), show (top) magnetic fields on the sun's surface near the south solar pole; (middle) an ultraviolet image of the 1 million degree plumes from the same region; and (bottom) an ultraviolet image of the "quiet" solar atmosphere closer...
Topics: What -- Extreme Ultraviolet Imaging Telescope, What -- Opportunity, What -- Polar, What -- SOHO,...
Source: http://sohowww.nascom.nasa.gov/gallery/SolarCorona/eit017.html
NASA Images
by NASA/Solar & Heliospheric Observatory
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Sequence of SOHO/EIT images showing a shock wave running across the solar disk. The shock wave originated in the vicinity of a flaring solar active region; the flare began on 1997 April 7 at 13:59 UT, in conjunction with the flare, a large "halo" coronal mass ejection (CME) (see LASCO image http://sohowww.nascom.nasa.gov/gallery/LASCO/las015.gif and the special page on the 1997 April 7-9 solar-terrestrial event, http://umbra.nascom.nasa.gov/eit/cme/april7/index.html . EIT recorded...
Topics: What -- Sun, What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/SolarCorona/eit022.html
NASA Images
by NASA/Solar & Heliospheric Observatory
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A SOHO-EIT image showing a huge eruptive prominence in the resonance line of singly ionized helium (He II) at 304 Angstroms in the extreme ultraviolet. While the filament was active at least nine hours before this exposure, the eruption started less than three hours before this image was obtained (1997 August 26 at 16:07 UT). The material in the eruptive prominence is at temperatures of 60,000 - 80,000 K, much cooler than surrounding corona, which is typically at temperatures above 1 million K....
Topic: What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/SolarCorona/eit023.html
NASA Images
by NASA/Solar & Heliospheric Observatory
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A time series of SOHO-EIT images showing the development of a huge, eruptive prominence on 1997 August 27. The images were obtained with EIT's unique, normal-incidence, multilayer-coated telescope in the resonance line of singly ionized helium (He II) at 304 Angstroms in the extreme ultraviolet. The material in the eruptive prominence is at temperatures of 60,000 - 80,000 K, much cooler than surrounding corona, which is typically at temperatures above 1 million K. By the fourth frame, the...
Topic: What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/SolarCorona/eit024.html
NASA Images
by NASA/Solar & Heliospheric Observatory
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Sequence of SOHO-EIT images showing a shock wave expanding across the solar disk from the site of the origin of a coronal mass ejection (CME), 1997 May 12. A halo CME was observed by SOHO-LASCO. EIT recorded these images in the emission lines of Fe XII near 195 A; this ion is formed at temperatures of about 1.5 million degrees. The wave front travels at speeds of ~ 300 km/s, typical of a fast mode Alfv?n shock in the lower solar corona.
Topics: What -- SOHO, What -- FAST
Source: http://sohowww.nascom.nasa.gov/gallery/SolarCorona/eit025.html
NASA Images
by NASA/Solar & Heliospheric Observatory
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Sequence of SOHO-EIT first difference images showing the intensity (density) enhancement and following rarefaction associated with a shock wave expanding across the solar disk from the site of the origin of a coronal mass ejection (CME), 1997 May 12. A halo CME was observed by SOHO-LASCO. These images were formed from the differences of successive images in the emission lines of Fe XII near 195 A; this ion is formed at temperatures of about 1.5 million degrees. The wave front travels at speeds...
Topics: What -- SOHO, What -- FAST
Source: http://sohowww.nascom.nasa.gov/gallery/SolarCorona/eit026.html
NASA Images
by NASA/Solar & Heliospheric Observatory
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SOHO-EIT image from 14 September 1997 showing a huge eruptive prominence in the resonance line of singly ionized helium (He II) at 304 Angstroms in the extreme ultraviolet. The material in the eruptive prominence is at temperatures of 60,000 - 80,000 K, much cooler than the surrounding corona, which is typically at temperatures above 1 million K.
Topic: What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/SolarCorona/eit027.html
NASA Images
by NASA/Solar & Heliospheric Observatory
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eye 18
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SOHO-EIT image in resonance lines of eight and nine times ionized iron (Fe IX/X) at 171 Angstroms in the extreme ultraviolet showing the solar corona at a temperature of about 1 million K. This image was recorded on 11 September 1997. It is dominated by two large active region systems, composed of numerous magnetic loops.
Topic: What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/SolarCorona/eit028.html
NASA Images
by NASA/Solar & Heliospheric Observatory
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SOHO-EIT image in resonance lines of eleven times ionized iron (Fe XII) at 195 Angstroms in the extreme ultraviolet showing the solar corona at a temperature of about 1 million K. This image was recorded on 11 September 1997. It is dominated by two large active region systems, composed of numerous magnetic loops.
Topic: What -- SOHO
Source: http://sohowww.nascom.nasa.gov/gallery/SolarCorona/eit029.html